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* `.font-normal` is too generic. Rename it to `.font-weight-normal` for clarity.
* Rename `.font-bold` to `.font-weight-bold` so as to parallel `.font-weight-normal`.
* In docs, gloss "weight" term in relation to fonts for the benefit of non-typographiles.

Refs #18433

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Erratum from 26da610b
Refs #18001

These can be replaced by their `.text-xs-*` parallels.
This also avoids any complications from interactions between the responsive and non-responsive classes.
(e.g. `<div class="text-left text-md-right">`)

Refs #18300
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Closes #18314 by merging a tweaked version of it.

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Refs #16836
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- Simplifies variables usage
- Makes components and brand variable usage more consistent (dark bg and white text throughout instead of some mixed light and dark bgs)
- Very likely means lower contrast and thus no more AA compliance (we'll want to fix that eventually obviously)

Fixes #13583: Move .sr-only and .sr-only-focusable to mixins, then use them to create classes in _utilities.scss

.hidden is incompatible with jQuery's $(...).hide()

Use grid classes or mixins on .dl-horizontal, update docs to include it, removes auto truncate and makes .text-overflow mixin into a .text-truncate class and mixin combo for better granularity

Fixes #13974, #14123: Remove translate3d repaint performance enhancement for text rendering and position wonkiness

Moving the embed to it's own CSS file, moving the docs to the Components page with an example, fixing a Glyhpicons list problem in the docs